US2700468A - Centrifugal method and apparatus for separating solids - Google Patents

Centrifugal method and apparatus for separating solids Download PDF

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Publication number
US2700468A
US2700468A US87076A US8707649A US2700468A US 2700468 A US2700468 A US 2700468A US 87076 A US87076 A US 87076A US 8707649 A US8707649 A US 8707649A US 2700468 A US2700468 A US 2700468A
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solids
liquid
cyclone
particles
vortex
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US87076A
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Fontein Freerk Jan
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Stamicarbon BV
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Stamicarbon BV
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/24—Multiple arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B04C5/04—Tangential inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/081—Shapes or dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/103—Bodies or members, e.g. bulkheads, guides, in the vortex chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/107—Cores; Devices for inducing an air-core in hydrocyclones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C7/00—Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00

Definitions

  • FIG. 11 3O iapgapiial discharge of 2 'I g mlddllflgs i 29 tangential dischargg z of coarsa ma1arials 2 a l l I 6 1 21 a i 1 infaad of liquid g: i
  • the invention relates to a centrifugal method and means for fractionating solids in liquid suspension thereof according to the settling rate or said solids. More specifically the invention relates to that process and the means for performing that process, according to which a separation between solid particles of different settling rates isobtained in aliquid body compelled to rotate rapidly in a confined circular space by feeding a stream or liquid tangentially into said space and continuously discharging part of the liquid at one end and centrally 'be obtained easily in the central layers corresponding to a centrifugal acceleration up to 10,000 times .that of gravity or even more for devices of small crosssectionaldiameter.
  • the circumferential speed of the liquid body, corresponding to the infeed speed will be much lower than the rotational speed at the center.
  • This int'eed speed depends on the dimensions of the device used and the pressure applied to the infeed, but, generally speaking, this speed can be said as to be of the orderwof magnitude of feet per second for devices of -20 inches maximum cross-sectional diameter, increasing to the order of magnitude of feet per second for devices not. over 2 inches maximum diameter, for normal operations although speeds as high as 100 feet per second may be obtained when applying high feed pressures.
  • the solid particle Will respond to the difference of the corresponding forces being the centrifugal force and the body will react to the forces corresponding 'to those three vdistinct directions of flow in such a way that:'
  • the reaction of'the solid particle to each of these forces depends on the particle itself, greater and heavier particles being more responsive to the centrifugal force and smaller and lighter particles on the contrary being more responsive to the frictional force of flow.
  • This phenomenon can and has hitherto been used for fractionating solids, feeding a liquid suspension of such solids tangentially into a confined circular space, centrally and continuously discharging part of the liquid together with the finer and lighter solids nearthe center ice continuously discharging part of the liquid containing the coarser and heavier solids.
  • the invention calls for tangentially introducing liquid into a confined circular space to create a rapidly rotating liquid body therein, feeding a mixture of solids axially into said space continuously discharging part of the liquid and solids of relatively low settling rates centrally at one end whereby to create an inward How of liquid and continuously discharging other parts of the liquid and solids of relatively high settling rates elsewhere.
  • This method is distinguished from'the other methods referred to hereabove in that the "displacement in radial direction of the solid particles is reversed. Hitherto, the particles of relatively low settling rates were dragged to the core, whereas the particles of relatively high settling rates remained at'the circumference, being not able to yield to the inward force of flow as they were retained by the centrifugal force.
  • the solids are introduced axially into the liquid body, that is to say in the central zones. The particles -of relatively low settling rate'will now remain in that core and the particles of relatively high settling rates will be thrown towards the circumference. This difference results in a considerable increase in sharpness of separation.
  • This liquid fiow force is impelling .onrthe particles causing them to travel or to bedragged ..-tow.ards the several discharges. This dragging or'fric- -tional.
  • the radial flow is small as compared with the sameforcein-the core'parts of .theliquid body and asa resultthe impact on'the solid rparticlesrcausedby:.the axial 'foree of-flow will be higher at the circumference relatively to theirnnact due to the .radial force of flow, as compared'with the same impact at. the ..center.
  • FIG. 3 also gives a diagrammaticalview of one special type of device in which the improved method according to the-invention -maybe carriedout; which-type is comture of solids of; equalspecific gravity.
  • the cyclone.,of.flFig. v6. consistsrof .a cylindrical part 1, to which a conical part 2 and a cover plate 3 with r-zentralaperture 4 are attached.
  • a short pipe or vortex finder-5 serves as a separationbetween the outer and inner vortex near thisaperture.
  • the conical part is provided with an axial aperture 6 for the coarser fraction.
  • Atangential feedpipe 7 enables; the liquid;to,be snpplied under pressure.
  • Aperture 4 gives access to hood 8, which is providedwith.atangentialoutlet 9 for the finer fraction.
  • funnel 10 the product to be separated can be fed into the centre of the cyclone at 11. 'The'flow of the liquid in the cyclone.
  • a conicali cyclone might be, installed in a vertical position if a divider is fitted'in the heart of the cycloneby which the down falling mixture would for instance be dispersed ;in a horizontal. direction. In this. .way :how-
  • a funnel 20theproduct to be classified is fed-into the-cycloneas far as the base"(in this. case the top side )-in-adryor' pulpystate from where it is-entrainedby the liquid and separated into a finer and coarser fraction.
  • the qui i This can be avoided by a rotating feed of the mixture to be separated.
  • the cyclone is preferably fitted with a spin chamber which is connected with the cyclonic space by means of the central top aperture of the latter, and the mixture to be separated is tangentially fed to the spin chamber as a concentrated suspension, so that this mixture adopts a rotating movement similar to the rotation of the liquid mass in the cyclone.
  • the rotating concentrated suspension leaving the vortex chamber mixes with the similarly rotating liquid in the cyclone.
  • hood 23 is not fixed at the base 14, but on the opposite top side 13, giving access to the cyclonic space via an aperture 22.
  • the hood is provided with a tangential feed pipe 21. Its operation is as follows.
  • water is supplied to the cyclone through pipe 15, partly leaving the cyclone through discharge tube 16, partly at 17.
  • a very concentrated suspension of the mixture to be separated is pressed into the hood via the supply pipe 21, where it adopts a rotating motion, subsequently while this motion is continued, it enters axially the cyclone where it is caught by the inner vortex.
  • the finer particles are retained by this vortex and are discharged via base aperture 17, the coarser ones are dispersed and leave the cyclone through the tangential outlet 16.
  • a conical spin chamber may be employed for feeding the mixture.
  • hood 23 of Fig. 8 is replaced by a conical chamber, the apex of which is directed to the aperture 22.
  • Figs. 7 and 8 may be operated in any position desired.
  • the invention may also be realized by means of a rotating liquid body in which the axial direction of the liquid rotating round the axis is equal to the direction of the liquid rotating along the periphery. This is attained if both parts of the liquid body are carried oil from the confined circular space at the side opposite to the supply.
  • the coarse particles are discharged through pipe 25,.the fines leave through thecentral outlet 17 and pass into chamber 18 from where they are carried oif through the tangential pipe 19. g
  • the substance to be separated is centre-fe n a rotating movement by supplying a concentrated suspension tangentially to chamber 23 through tube 21.
  • the rotating motion is created by pressing water into the classifying chamber via feed pipe 24.
  • the suspension in chamber.23 is too highly concentrated to obtain a classification.
  • the speed of rotation in the rotation chamber may also beconsiderably smaller than in the classifying chamber.
  • the suspension enters the classifying chamber through aperture 22.
  • the coarser and finer particles are discharged through pipe 25 and opening 17 respectively.
  • This type of apparatus may be symmetrically duplicated because unlike in the case of cyclones the side at which the mixture is supplied is not provided with an axial discharge aperture.
  • the common base may in this case be dispensed with and the feed will be a tangential one which is located in the circumferencebetweensthe aromas two; axial; extremities: while the liqiuuid: supplied will be divided into two; vortices axiallymoving; in opposite direptionsthrough the two-halves of-thedevice.
  • the liquid body By withdrawing parts of the liquid massdecreasing in diameter from points located: at variousdistances from the axi s,-.the liquid body may be considered to'consist of a nurnber oflayers'each-having; itsindividual discharge.
  • the layer, round-the axis is-discharge'd axially.
  • the diameter stepwise at the-points where the liquid; is' draw-n offtangentially Thernixture may alsobe supplied as a rotating conqentrated suspension, through a central. opening:- in the base.
  • an: additional; rotating; space is constructed on the other side of the base, to which the suspensionis tangentially suppliedunder pressure.
  • the tangential discharge tubejs may'be'fitted at more thantwo placesthus increasing. the number of fractions obtained to 9 or more.
  • the apparatus accordingto Fig. 115 may be duplicated symmetrically while; the base-plate is left out.
  • the first: cyclone may at the top be pro'yid'ed with atubularoutlet which extends into the second cyclone either through the base or through the top apertureof the latter v a this-case the first cyclone is preferably c'onically constructed, Because throu h-thecentralapex a rotating fraction: can be drawn. off? If the second cyclone is a cylindrical one the fraction will he supplied via anaxial feed in the top side which. at-thesame time can be used as theito'p' discharge ofthe former. a V
  • Iii Figs: 12 and 13 two" devices are represented for the separationof mixtures into" more than three fractions by rn'e'ansof the cyclonic action;
  • the formervortex carries the coarser particles through apex aperture 33into the cyclonicspace 35, whereas the liner: particles are transported into the hood 36- by the inner vortex via'baseapert'ure'34, leaving; said ho'od tange'ntially' via-tubei 37-.
  • thecoverplate 413 mustbe considered-as the top and the topap ertureis formed by the opening giving, access; to tube- 42, in which the liquid can entertangentially-r This'ofiers the advantage ;that obstructing; is-less: likely to occur.
  • The; cyclones 31" can be constructed asrepresented-by Fig. 6 thus: inthefirst cyclones already t'a'lging; advantage of theinvention. Irrthis-case thedeviceshould naturally either befavored such a position that-its axis-is'inclined to the-vertical or be'prov-ided-with-a divider for the mixture to be separated. a
  • Figure 14- isa view showing-the cyclone of Fig. 6 in which the axis of the cyclone is inclined to the vertical.
  • the classifying medium has always been understood to be water. It is also possibleto use other liquids bywhich depending; on their specific' gravi ty, a separation-according toanother grain sizeiseffect'ed. Thiscan alsobe obtained :by adjusting the dischargeapertures and/or the supply pressure in the way as has been suggested for the cyclone (Dutch Patent specification No. 48,934). If for instance thedischargeopening 25 of the devices represented by the Figs. 9 and 10 is narrowed, more" liq'uidwill have to be discharged through the axial outlet 17. Consequently the gradient of the velocity of rotation increases towards the centre and also the centrifugal force.
  • the adjustment is preferably carried out by means of an adjustable elastical'iris diaphragm in or behind the'ap'ertures (irrthe Fig'SzQ and IOin the tube 25','respectively'behind the aperture'l'7', intheotherfigure's behind-'the'co'rre sponding apertures).
  • an adjustable elastical'iris diaphragm in or behind the'ap'ertures (irrthe Fig'SzQ and IOin the tube 25','respectively'behind the aperture'l'7', intheotherfigure's behind-'the'co'rre sponding apertures).
  • a hollow air operated rubber ring' may be employed, or a perforated rubberdi'sc; thein'side'di'ameter of which can be varied
  • a cyclone comprising a conical vortex chamber having an outlet opening at its apex, a feed conduit for a liquid mass separation media opening tangentially to the larger end of the vortex chamber, a transverse wall at the larger end of the vortex chamber provided with a central outlet opening, an infeed tube for the material to be separated, said infeed tube extending axially into the vortex chamber through and centrally of said last mentioned outlet opening so that the inner and material delivering end of said tube faces the apex outlet of the vortex chamber, the outer surface of said tube being spaced radially inwardly from the edge of said last mentioned outlet opening to define an annular outlet for separated material concentric with said tube, the'inner and material delivery end of said tube being positioned at a point spaced from and in axial alignment with the apex outlet opening of the vortex chamber, the vortex chamber being unobstructed at least between the inner and material delivery end of said infeed tube and the apex outlet opening.
  • a cyclone of the character described in claim 1 including means to support. the cyclone vortex chamber with its axis inclined at an angle to the vertical.
  • a cyclone comprising a conical vortex chamber having an outlet opening at its apex, a feed conduit for a liquid mass separation media opening tangentially to the larger end of the vortex chamber, a transverse wall at the larger end of thevortex chamber provided with a centraloutlet opening, an outlet chamber beyond said wall and provided with an outlet opening and an end wall, an infeed tube for the material to be separated, said infeed tube being positioned centrally of said last-mentioned wall and extending axially into the vortex chamber through the central outlet opening of said transverse wall so that the inner and material delivering end of said tube faces the apex outlet of the vortex chamber, the outer surface of said tube being spaced radially inwardly from the edge of said last-mentioned outlet opening to define an annular outlet for separated material concentric with said tube, the inner and material delivery end of said tube being positioned at a point spaced from and in axial alignment with the apex outlet opening of the vortex chamber, the vortex chamber being unobstruc
  • a cyclone of the character described in claim 5 wherein the material delivering end of said infeed tube is positioned adjacent the larger end of the vortex chamber.
  • a cyclone of the character described in claim 5 including means to support the cyclone vortex chamber with its axis inclined at an angle to the vertical.
  • a cyclone comprising a conical vortex chamber having an outlet opening at its apex, a feed conduit for a liquid mass separation media opening tangentially to the larger end of the vortex chamber, a transverse wall at the larger end of the vortex chamber provided with a central outlet opening, an infeed tube for the material to be separated, said infeed tube extending axially into the vortex chamber through and centrally of said last-mentioned .outlet opening so that the inner and material delivering end of said tube faces the apex outlet of the vortex chamber, the inner and material delivery end of said tube being positioned at a point spaced from and in axial alignment with the apex outlet opening of the vortex chamber, the vortex chamber being unobstructed at least between the inner and material delivery end of said infeed tube and the apex outlet opening, means to deliver a liquid mass separation media through said feed conduit under sulficient pressure to produce in said chamber inner and outer vortices rotating about a central air column which extends between the a
  • Apparatus for continuously classifyinga'mixtureof solids to: segregate solids settling faster than: a predetermined rate of s'ettlingi'nto a liquid-suspended coarse fractionand into a liquid-suspendedfines-fraction, which comprises an-enclosed circular casing having one discharge outlet for-the"-'coarse' fraction" and an axial annu-lar discharge 'outlet for the finesafraction, means for force-feeding liquid tangentially to the casing with pressure sufficient to set up in the casinga vortically rotating liquid body with inner and outer layers adapted centrifugally to segregate coarse solids inthe 'outer layers-and to 'segregate fine solids in the inner layers, and funnel means for conducting the classifiable mixture of solids axially and 'centrallythrough the casing to deliver it into the inner layers Where the fine solids are retained from substantial departure therefrom.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Fluid Mechanics (AREA)
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US87076A 1948-04-14 1949-04-12 Centrifugal method and apparatus for separating solids Expired - Lifetime US2700468A (en)

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US (1) US2700468A (xx)
BE (1) BE488454A (xx)
DE (1) DE804430C (xx)
FR (1) FR984678A (xx)
GB (1) GB671943A (xx)
NL (2) NL139918C (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487923A (en) * 1968-08-28 1970-01-06 Canadian Patents Dev Apparatus for separating aqueous suspensions of solid particles
US4950389A (en) * 1988-04-14 1990-08-21 Pilat Boris V Gravity concentrator
WO2002067754A1 (en) * 2001-02-24 2002-09-06 Dyson Ltd Cyclonic separating apparatus
EP3826747A4 (en) * 2018-07-23 2022-04-27 Veolia Water Solutions & Technologies Support APPARATUS FOR THE ELIMINATION OF GRAIN BY WHIRLPOOL WITH FOUCAULT GENERATOR

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2723750A (en) * 1955-11-15 Hydrocyclone
US2783887A (en) * 1957-03-05 Cyclone separator
US2701056A (en) * 1951-09-01 1955-02-01 Thomas R Morton Method and apparatus for classifying and concentrating materials
DE929119C (de) * 1951-09-05 1955-07-11 Stamicarbon Verfahren zur Gewinnung von Staerke
DE929120C (de) * 1951-09-05 1955-06-20 Stamicarbon Verfahren zur Gewinnung reiner Staerke
US2725983A (en) * 1953-10-30 1955-12-06 Rakowsky Victor Whirlpool separation of particulate materials
DE1186001B (de) * 1959-05-29 1965-01-28 Coal Industry Patents Ltd Hydrozyklon zur Nassaufbereitung von wichtedifferenziertem Material
IT1152915B (it) * 1982-10-18 1987-01-14 Prominco Srl Apparecchio per la separazione di miscele di solidi, in particolare miscele di minerali, in almeno tre prodotti di differente peso specifico

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US762868A (en) * 1902-07-23 1904-06-21 Henry A Allen Apparatus for separating materials of different gravities.
US856611A (en) * 1905-03-27 1907-06-11 William Rattle Process of separating or classifying ores.
GB191314428A (en) * 1913-06-21 1914-06-23 Claude Vautin Improvements in or relating to the Dressing of Ores.
US1115897A (en) * 1913-10-14 1914-11-03 Sylvester Clingmon Buchanan Cone-classifier.
US1149463A (en) * 1913-05-02 1915-08-10 Frank Pardee Apparatus for separating coal, ore, &c.
US1197946A (en) * 1913-05-02 1916-09-12 Frank Pardee Apparatus for separating coal, ore, &c.
US1595257A (en) * 1925-10-03 1926-08-10 Albert H Stebbins Cyclone classifier
US1624518A (en) * 1925-12-10 1927-04-12 Albert H Stebbins Air-blast classifier
US1669820A (en) * 1926-09-07 1928-05-15 Susquehanna Collieries Company Method and means for effecting the separation of subdivided materials
US1845358A (en) * 1929-10-29 1932-02-16 Albert H Stebbins Separator for treating material laden air
US1897144A (en) * 1933-02-14 Dust separator and collector system
US2104537A (en) * 1937-02-12 1938-01-04 Ellis Russell Scott Method of and means for separating particles of solid material by flotation
GB506488A (en) * 1937-10-29 1939-05-30 Ig Farbenindustrie Ag A process and apparatus for separating pulverulent materials
US2312706A (en) * 1938-11-19 1943-03-02 Nichols Eng & Res Corp Method and apparatus for separating heavy particles from paper pulp suspensions
US2329299A (en) * 1941-10-29 1943-09-14 Johns Manville Pneumatic classifier
CH238137A (de) * 1942-08-17 1945-06-30 W Eicher Zyklon.
US2554480A (en) * 1948-01-08 1951-05-22 Walter N T Morton Ore concentrator
US2590691A (en) * 1945-07-31 1952-03-25 Directie Staatsmijnen Nl Process for the separation of solid substances of different specific gravity and grain size

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1897144A (en) * 1933-02-14 Dust separator and collector system
US762868A (en) * 1902-07-23 1904-06-21 Henry A Allen Apparatus for separating materials of different gravities.
US856611A (en) * 1905-03-27 1907-06-11 William Rattle Process of separating or classifying ores.
US1149463A (en) * 1913-05-02 1915-08-10 Frank Pardee Apparatus for separating coal, ore, &c.
US1197946A (en) * 1913-05-02 1916-09-12 Frank Pardee Apparatus for separating coal, ore, &c.
GB191314428A (en) * 1913-06-21 1914-06-23 Claude Vautin Improvements in or relating to the Dressing of Ores.
US1115897A (en) * 1913-10-14 1914-11-03 Sylvester Clingmon Buchanan Cone-classifier.
US1595257A (en) * 1925-10-03 1926-08-10 Albert H Stebbins Cyclone classifier
US1624518A (en) * 1925-12-10 1927-04-12 Albert H Stebbins Air-blast classifier
US1669820A (en) * 1926-09-07 1928-05-15 Susquehanna Collieries Company Method and means for effecting the separation of subdivided materials
US1845358A (en) * 1929-10-29 1932-02-16 Albert H Stebbins Separator for treating material laden air
US2104537A (en) * 1937-02-12 1938-01-04 Ellis Russell Scott Method of and means for separating particles of solid material by flotation
GB506488A (en) * 1937-10-29 1939-05-30 Ig Farbenindustrie Ag A process and apparatus for separating pulverulent materials
US2312706A (en) * 1938-11-19 1943-03-02 Nichols Eng & Res Corp Method and apparatus for separating heavy particles from paper pulp suspensions
US2329299A (en) * 1941-10-29 1943-09-14 Johns Manville Pneumatic classifier
CH238137A (de) * 1942-08-17 1945-06-30 W Eicher Zyklon.
US2590691A (en) * 1945-07-31 1952-03-25 Directie Staatsmijnen Nl Process for the separation of solid substances of different specific gravity and grain size
US2554480A (en) * 1948-01-08 1951-05-22 Walter N T Morton Ore concentrator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487923A (en) * 1968-08-28 1970-01-06 Canadian Patents Dev Apparatus for separating aqueous suspensions of solid particles
US4950389A (en) * 1988-04-14 1990-08-21 Pilat Boris V Gravity concentrator
WO2002067754A1 (en) * 2001-02-24 2002-09-06 Dyson Ltd Cyclonic separating apparatus
US6607572B2 (en) 2001-02-24 2003-08-19 Dyson Limited Cyclonic separating apparatus
AU2002226554B2 (en) * 2001-02-24 2004-06-24 Dyson Technology Limited Cyclonic separating apparatus
US20040144070A1 (en) * 2001-02-24 2004-07-29 Gammack Peter David Cyclonic separating apparatus including upstream and downstream cyclone units
US6994740B2 (en) 2001-02-24 2006-02-07 Dyson Limited Cyclonic separating apparatus including upstream and downstream cyclone units
CN100334997C (zh) * 2001-02-24 2007-09-05 戴森技术有限公司 旋风分离装置
EP3826747A4 (en) * 2018-07-23 2022-04-27 Veolia Water Solutions & Technologies Support APPARATUS FOR THE ELIMINATION OF GRAIN BY WHIRLPOOL WITH FOUCAULT GENERATOR

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NL139918C (xx)
BE488454A (xx)
FR984678A (fr) 1951-07-09
GB671943A (en) 1952-05-14
NL70738C (xx)
DE804430C (de) 1951-04-23

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